Tab Session Manager by sienori

Save and restore the state of windows and tabs. It also supports automatic saving and cloud sync.

• Save and restore windows and tabs
• Manage sessions with name and tags
• Auto save when window is closed
• Auto save at regular intervals
• Import and export sessions
• Compatibility with Chrome extension
• Cloud sync
• Support tab groups
• Import Session Buddy

Chrome version:
https://chrome.google.com/webstore/detail/tab-session-manager/iaiomicjabeggjcfkbimgmglanimpnae
Edge version:
https://microsoftedge.microsoft.com/addons/detail/jkjjclfiflhpjangefhgfjhgfbhajadk

USERS:

• Since updating to version 3.0.0, there is a problem that the session list can not be opened. Please see here for solutions. https://github.com/sienori/Tab-Session-Manager/wiki/IndexedDB-Error
• Vote on Mozilla website for APIs/bug fixes needed by session managers, so they can be better. https://github.com/sienori/Tab-Session-Manager/issues/364

Version 6.11.0

• Supported importing Firefox session store backups files
• Improved login prompt not to appear during automatic cloud sync
  • A red badge on the extension icon will notify you when manual login is required.
• Improved the appearance of tags in autosaved and startup sessions
  • Shortened the tag name and changed the tag icon.
• Adjusted the color of the session list to improve visibility
• Fixed an issue where importing Session Buddy files failed
• Fixed an issue where upload of sessions with long names failed in cloud sync
• Fixed an issue where "Open in current window" opens different order tabs when pinned tabs exists

Version 6.10.0

• Added the ability to import and export settings
• Supported the import of Session Buddy session files

Version 6.9.0

• Added the ability to add the current tab to the session
  • Right-click on the window title or click on the Edit button to display the menu.
• Visualized incognito windows on the toolbar popup
• Improved the position of the notification on the toolbar popup
• Fixed an issue where the incognito window could not be restored in Chrome
  • When loading a incognito window, lazy loading is disabled.
• Fixed an issue where the window title is not displayed in Chrome
• Fixed an issue where ignoring URLs in "Replace with current window" was not working

See more release notes
https://github.com/sienori/Tab-Session-Manager/releases

I was inspired by the following great add-ons, developed as an add-on for Firefox 57 or later.
Session Manager by Michael Kraft
http://sessionmanager.mozdev.org/index.html